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A157904 as a simple table

na(n)
01
12
24
38
417
536
678
7170
8375
9833
101870
114229
129654
1322223
1451622
15120961
16286029
17682398
181642821
193990231
209777678
2124166327
2260233185
23151350709
24383287499
25977918150
262512805727
276500178867
2816921248231
2944310852884
30116678914575

[1,2,4,8,17,36,78,170,375,833,1870,4229,9654,
 22223,51622,120961,286029,682398,1642821,3990231,
 9777678,24166327,60233185,151350709,383287499,
 977918150,2512805727,6500178867,16921248231,
 44310852884,116678914575]